Rationalize main production and noctua / NEO autocomplete index creation (and codebase)

[kltm]

Currently, as an apparent result of #620 (specifically 65be1ca and possibly part of 7b4ff9e from #634).

The fix to this is one of the following:

1. do a mini-refactor so that the default relation is exposed at the config level and have NEO and standard production use different configs
2. if possible (need to check on this) switch the NEO load so that is it using isa_partof instead of regulates, to bring it inline with master and other index creation

In the interim, I'm going to create an AmiGO branch that tracks master except for those two code lines so that @abessiari can continue with Noctua devops testing.